If the data from your Fitbit watch does not sync with Hexfit, here are some solutions:
Go check that your watch is well synchronized in the application
Tab: Synchronization of accounts
2. Disconnect and reconnect the two applications:
From your Fitbit app, go to “Applications”.
Make sure that "Activity" is in the accesses. If this is not the case, click on "Block access"
Then go back to synchronize from your Hexfit account (Point 1)